English verb conjugation
CAN ECHO

Regular verb: echo - echoed - echoed

Affirmation

Simple form	V-ing form
I can echo you can echo he can echo we can echo you can echo they can echo	I can be echoing you can be echoing he can be echoing we can be echoing you can be echoing they can be echoing
Perfect	V-ing perfect
I can have echoed you can have echoed he can have echoed we can have echoed you can have echoed they can have echoed	I can have been echoing you can have been echoing he can have been echoing we can have been echoing you can have been echoing they can have been echoing

Negation

Simple form	V-ing form
I can't echo you can't echo he can't echo we can't echo you can't echo they can't echo	I can't be echoing you can't be echoing he can't be echoing we can't be echoing you can't be echoing they can't be echoing
Perfect	V-ing perfect
I can't have echoed you can't have echoed he can't have echoed we can't have echoed you can't have echoed they can't have echoed	I can't have been echoing you can't have been echoing he can't have been echoing we can't have been echoing you can't have been echoing they can't have been echoing

Interrogative form

Simple form	V-ing form
can I echo? can you echo? can he echo? can we echo? can you echo? can they echo?	can I be echoing? can you be echoing? can he be echoing? can we be echoing? can you be echoing? can they be echoing?
Perfect	V-ing perfect
can I have echoed? can you have echoed? can he have echoed? can we have echoed? can you have echoed? can they have echoed?	can I have been echoing? can you have been echoing? can he have been echoing? can we have been echoing? can you have been echoing? can they have been echoing?

Interro-negative form

Simple form	V-ing form
can't I echo? can't you echo? can't he echo? can't we echo? can't you echo? can't they echo?	can't I be echoing? can't you be echoing? can't he be echoing? can't we be echoing? can't you be echoing? can't they be echoing?
Perfect	V-ing perfect
can't I have echoed? can't you have echoed? can't he have echoed? can't we have echoed? can't you have echoed? can't they have echoed?	can't I have been echoing? can't you have been echoing? can't he have been echoing? can't we have been echoing? can't you have been echoing? can't they have been echoing?